argument45 [Jet]小组第三次作业

reachyUID: 2276902

TOPIC: ARGUMENT45 - The following appeared as an editorial in a wildlife journal.

"Arctic deer live on islands in Canada's arctic region. They search for food by moving over ice from island to island during the course of a year. Their habitat is limited to areas warm enough to sustain the plants on which they feed, and cold enough, at least some of the year, for the ice to cover the sea separating the islands, allowing the deer to travel over it. Unfortunately, according to reports from local hunters, the deer populations are declining. Since these reports coincide with recent global warming trends that have caused the sea ice to melt, we can conclude that the decline in arctic deer populations is the result of deer being unable to follow their age-old migration patterns across the frozen sea."
WORDS: 373          TIME: 0:55:24          DATE: 2008-2-8

The arguer's view seems to be sound and convincing at first glance that the decline in arctic deer populations is the result of deer being unable to follow their age-old migration patterns across the frozen sea. However, I am afraid his argument can hardly bear further consideration since there are sever flaws in it.
Arctic deer live on the area which is warm enough to sustain the plants on which they feed. So the deer have to move to warm places where deer need to cross the frozen sea when the primary one is going to be cold. The arguer said that recent global warming make the road melted and lost, then the deer populations are declining without food. However, we can hardly find that the evident that the frozen sea which the deer travel over it was melted caused by global warming. It might possible that this road  is in some place where not influenced by global warming or little influenced. In other words, the area of sea is still frozen so solid when winter is coming that it permits the deer to cross it.
Secondly, the plants growing needs warm environments and the primary places that feed deer is cold when winter comes. However, all the global is warmer than before now. It is possible that the area where there are no plants in winter becomes warm enough to sustain the plants in winter now. Then the deer could live there without migration every year. From this side, we can conclude that the global warming might not be the reason of the deer population declining.
The last one, there are still a lot of reasons that cause the wild animals declining except climate. For example, if the amount of hunting increases, the wild animals, including arctic deer, would die a lot without enough new ones born no matter how the climate is changing. For another example, if the plants that feed deer are lost too much caused by people or insects, the deer would not live too much, either.
Anyway, I disagree that the decline in arctic deer populations is the result of the frozen sea melted. But further investigation and analysis are needed before the further conclusion and ultimate action.